OK, is there a way to put in that lisp also some keys combination? At the moment
I need to modify mu CUI file to get some useful shortcuts for variables, like this
Unfortunately not direct through Lisp. Lisp only seems to allow editing menus / toolbars programatically. So you might need DotNet in this case.
Alternatively, why not add your own partial CUIx? Have your LSP file menuload that and then have a cleanup command to menu-unload it once you're finished. The partial "should" overwrite any shortcuts from the original machine's cuix(es).